The extraordinary influx of Chinese clean energy investments into the United States and the torrid pace at which new generation has been added has led U.S. policymakers to wring their hands in frustration, and some have proposed "Buy American" requirements to counter the trend. But what's really going on in the marketplace? A new study that looks beyond the headline investment figures and finds there to be little zero-sum competition between the two nations and, in fact, the two countries will need to cooperate in many ways in order to meet their respective carbon reduction goals.

Controlling sources of black carbon can provide important and cost-effective opportunities to pursue public health and climate co-benefits. Three experts analyze the science and politics behind black carbon issues in China.